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Still on this war path although the bleeding is slow and painful.
I've since replaced all coil packs and the crank position sensor along with the OE BMW plugs (NGK).
At the end of the day I'm still left with the rich codes. I swapped in my brother's MAF from his 330ci and after a quick drive I came up with a host of errors including misfires. I then swapped coil packs and the misfires followed on 2 cylinders so I just replaced them all. While running the scanner in KOEO (key in, engine off), I tried to start it and saw a code pop up referring to the crank position sensor (signal implausible). So I replaced that. After replacing that I saw something I hadn't seen in a long time, condensate coming out of the tail pipe! It has typically been sooty deposits on the pipes.
Anyhow, even with all that, I'm still left with the rich codes. I've tried running the car with and without the MAF but it runs the same! Just without the MAF plugged in it goes into TRANS FAILSAFE PROG which I expected but still idles just fine.
My gas mileage at this point is 19.2 combined with about 50% highway/city so I really have nothing to complain about there.
I've booked it into BMW service (last time I tried the flippin' light didn't come on!) for the 18th of January. I'm really at a loss here. I have yet to actually test the O2s as someone mentioned that it is possible I could've fouled it if I hadn't resolved my problem with the misfires earlier on and just replaced them.
I'm really considering selling it just because of this but I know its such a good vehicle other than the friggin light keeps popping on every so often. And the repeatability of it is nuts. With the SES on, If I do a cold start, drive about 2-3 miles, shut it off, drive back about 2-3 miles then start it up again on the 3rd start, the SES light will go off. As I pondered on this I attributed it to the secondary air pump working during that time and reducing the 'richness' of the o2 signal so with the few starts and driving, it might think the problem went away. Again...
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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean 
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